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Carolyn Keene
Carolyn Keene is the pseudonym of the authors of both the Nancy Drew Mystery Stories (and a spin-off called River Heights) and The Dana Girls Mystery Stories, both produced by the Stratemeyer Syndicate.
The Stranger in the Shadows
Synopsis
When Paula DeJagger, an exchange student staying with one of Nancy's friends, begins acting strangely, Nancy investigates and discovers that Paula and other exchange students are being blackmailed to commit crimes